"""Tests for async pipeline: resume, cancellation, status guard, run lifecycle."""

import json

from physcom.engine.constraint_resolver import ConstraintResolver
from physcom.engine.scorer import Scorer
from physcom.engine.pipeline import Pipeline, CancelledError


def test_pipeline_run_lifecycle(seeded_repo):
    """Pipeline run should transition: pending -> running -> completed."""
    repo = seeded_repo
    domain = repo.get_domain("urban_commuting")
    config = {"passes": [1, 2, 3], "threshold": 0.1, "dimensions": ["platform", "power_source"]}
    run_id = repo.create_pipeline_run(domain.id, config)

    run = repo.get_pipeline_run(run_id)
    assert run["status"] == "pending"

    resolver = ConstraintResolver()
    scorer = Scorer(domain)
    pipeline = Pipeline(repo, resolver, scorer)

    pipeline.run(domain, ["platform", "power_source"], passes=[1, 2, 3], run_id=run_id)

    run = repo.get_pipeline_run(run_id)
    assert run["status"] == "completed"
    assert run["total_combos"] == 81
    assert run["started_at"] is not None
    assert run["completed_at"] is not None


def test_pipeline_run_failed(seeded_repo):
    """Pipeline run should be marked failed on error."""
    repo = seeded_repo
    domain = repo.get_domain("urban_commuting")
    config = {"passes": [1], "threshold": 0.1, "dimensions": ["platform", "power_source"]}
    run_id = repo.create_pipeline_run(domain.id, config)

    # Manually mark as failed (simulating what the web route does on exception)
    repo.update_pipeline_run(run_id, status="failed", error_message="Test error")

    run = repo.get_pipeline_run(run_id)
    assert run["status"] == "failed"
    assert run["error_message"] == "Test error"


def test_resume_skips_completed_combos(seeded_repo):
    """Re-running the same passes on the same domain should skip already-completed combos."""
    repo = seeded_repo
    domain = repo.get_domain("urban_commuting")

    resolver = ConstraintResolver()
    scorer = Scorer(domain)
    pipeline = Pipeline(repo, resolver, scorer)

    # First run: passes 1-3
    run_id_1 = repo.create_pipeline_run(domain.id, {"passes": [1, 2, 3]})
    result1 = pipeline.run(
        domain, ["platform", "power_source"],
        score_threshold=0.01, passes=[1, 2, 3], run_id=run_id_1,
    )
    assert result1.pass2_estimated > 0
    first_estimated = result1.pass2_estimated

    # Second run: same passes — should skip all combos (already pass_reached >= 3)
    run_id_2 = repo.create_pipeline_run(domain.id, {"passes": [1, 2, 3]})
    result2 = pipeline.run(
        domain, ["platform", "power_source"],
        score_threshold=0.01, passes=[1, 2, 3], run_id=run_id_2,
    )
    # pass2_estimated still counted (reloaded from DB) but no new estimation work
    # The key thing: the run completes successfully
    assert result2.total_generated == result1.total_generated
    run2 = repo.get_pipeline_run(run_id_2)
    assert run2["status"] == "completed"


def test_cancellation_stops_processing(seeded_repo):
    """Cancelling a run mid-flight should stop the pipeline gracefully."""
    repo = seeded_repo
    domain = repo.get_domain("urban_commuting")

    resolver = ConstraintResolver()
    scorer = Scorer(domain)
    pipeline = Pipeline(repo, resolver, scorer)

    run_id = repo.create_pipeline_run(domain.id, {"passes": [1, 2, 3]})

    # Pre-cancel the run before it starts processing
    repo.update_pipeline_run(run_id, status="running")
    repo.update_pipeline_run(run_id, status="cancelled")

    result = pipeline.run(
        domain, ["platform", "power_source"],
        score_threshold=0.01, passes=[1, 2, 3], run_id=run_id,
    )

    # Should have stopped without processing all combos
    run = repo.get_pipeline_run(run_id)
    assert run["status"] == "cancelled"
    # The pipeline was cancelled before any combo processing could happen
    assert result.pass2_estimated == 0


def test_status_guard_no_downgrade_reviewed(seeded_repo):
    """update_combination_status should not downgrade 'reviewed' to 'scored'."""
    repo = seeded_repo
    domain = repo.get_domain("urban_commuting")

    resolver = ConstraintResolver()
    scorer = Scorer(domain)
    pipeline = Pipeline(repo, resolver, scorer)

    # Run pipeline to get scored combos
    result = pipeline.run(
        domain, ["platform", "power_source"],
        score_threshold=0.01, passes=[1, 2, 3],
    )

    # Find a scored combo and manually mark it as reviewed
    scored_combos = repo.list_combinations(status="scored")
    assert len(scored_combos) > 0

    combo = scored_combos[0]
    repo.conn.execute(
        "UPDATE combinations SET status = 'reviewed' WHERE id = ?", (combo.id,)
    )
    repo.conn.commit()

    # Attempt to downgrade to 'scored'
    repo.update_combination_status(combo.id, "scored")

    # Should still be 'reviewed'
    reloaded = repo.get_combination(combo.id)
    assert reloaded.status == "reviewed"


def test_human_notes_preserved_on_rerun(seeded_repo):
    """Human notes should not be overwritten when re-running the pipeline."""
    repo = seeded_repo
    domain = repo.get_domain("urban_commuting")

    resolver = ConstraintResolver()
    scorer = Scorer(domain)
    pipeline = Pipeline(repo, resolver, scorer)

    # First run
    pipeline.run(
        domain, ["platform", "power_source"],
        score_threshold=0.01, passes=[1, 2, 3],
    )

    # Add human notes to a result
    results = repo.get_all_results(domain.name)
    assert len(results) > 0
    target = results[0]
    combo_id = target["combination"].id
    domain_id = target["domain_id"]

    repo.save_result(
        combo_id, domain_id,
        target["composite_score"],
        pass_reached=target["pass_reached"],
        novelty_flag=target["novelty_flag"],
        human_notes="Important human insight",
    )

    # Clear pass_reached so re-run processes this combo again
    repo.conn.execute(
        """UPDATE combination_results SET pass_reached = 0
           WHERE combination_id = ? AND domain_id = ?""",
        (combo_id, domain_id),
    )
    repo.conn.commit()

    # Re-run pipeline
    pipeline.run(
        domain, ["platform", "power_source"],
        score_threshold=0.01, passes=[1, 2, 3],
    )

    # Check that human_notes survived
    result = repo.get_existing_result(combo_id, domain_id)
    assert result["human_notes"] == "Important human insight"


def test_list_pipeline_runs(seeded_repo):
    """list_pipeline_runs should return runs for a domain or all domains."""
    repo = seeded_repo
    domain = repo.get_domain("urban_commuting")

    run_id_1 = repo.create_pipeline_run(domain.id, {"passes": [1]})
    run_id_2 = repo.create_pipeline_run(domain.id, {"passes": [1, 2, 3]})

    all_runs = repo.list_pipeline_runs()
    assert len(all_runs) >= 2

    domain_runs = repo.list_pipeline_runs(domain_id=domain.id)
    assert len(domain_runs) >= 2
    assert all(r["domain_id"] == domain.id for r in domain_runs)


def test_get_combo_pass_reached(seeded_repo):
    """get_combo_pass_reached returns the correct pass level."""
    repo = seeded_repo
    domain = repo.get_domain("urban_commuting")

    resolver = ConstraintResolver()
    scorer = Scorer(domain)
    pipeline = Pipeline(repo, resolver, scorer)

    pipeline.run(
        domain, ["platform", "power_source"],
        score_threshold=0.01, passes=[1, 2, 3],
    )

    # Get a scored combo
    scored_combos = repo.list_combinations(status="scored")
    assert len(scored_combos) > 0
    combo = scored_combos[0]

    pass_reached = repo.get_combo_pass_reached(combo.id, domain.id)
    assert pass_reached == 3

    # Non-existent combo
    assert repo.get_combo_pass_reached(99999, domain.id) is None


def test_blocked_combos_have_results(seeded_repo):
    """Blocked combinations should still appear in combination_results."""
    repo = seeded_repo
    domain = repo.get_domain("urban_commuting")

    resolver = ConstraintResolver()
    scorer = Scorer(domain)
    pipeline = Pipeline(repo, resolver, scorer)

    result = pipeline.run(
        domain, ["platform", "power_source"],
        score_threshold=0.01, passes=[1, 2, 3],
    )

    assert result.pass1_blocked > 0

    # All combos (blocked + scored) should have result rows
    all_results = repo.get_all_results(domain.name)
    total_with_results = len(all_results)
    # blocked combos get pass_reached=1 results, non-blocked get pass_reached=3
    assert total_with_results == result.pass1_blocked + result.pass3_scored

    # Blocked combos should have pass_reached=1 and composite_score=0.0
    blocked_results = [r for r in all_results if r["combination"].status == "blocked"]
    assert len(blocked_results) == result.pass1_blocked
    for br in blocked_results:
        assert br["pass_reached"] == 1
        assert br["composite_score"] == 0.0


def test_all_passes_run_and_tracked(seeded_repo):
    """With passes [1,2,3], all three should show nonzero counts in run record."""
    repo = seeded_repo
    domain = repo.get_domain("urban_commuting")

    resolver = ConstraintResolver()
    scorer = Scorer(domain)
    pipeline = Pipeline(repo, resolver, scorer)

    run_id = repo.create_pipeline_run(domain.id, {"passes": [1, 2, 3]})
    result = pipeline.run(
        domain, ["platform", "power_source"],
        score_threshold=0.01, passes=[1, 2, 3], run_id=run_id,
    )

    run = repo.get_pipeline_run(run_id)
    assert run["combos_pass1"] > 0, "Pass 1 counter should be nonzero"
    assert run["combos_pass2"] > 0, "Pass 2 counter should be nonzero"
    assert run["combos_pass3"] > 0, "Pass 3 counter should be nonzero"

    # Pass 2 should equal valid + conditional (blocked don't get estimated)
    assert run["combos_pass2"] == result.pass2_estimated
    # Pass 3 should equal pass3_scored (all scored combos, not just above threshold)
    assert run["combos_pass3"] == result.pass3_scored


def test_save_combination_loads_existing_status(seeded_repo):
    """save_combination should load the status of an existing combo from DB."""
    repo = seeded_repo
    from physcom.models.combination import Combination
    from physcom.models.entity import Entity

    entities = repo.list_entities(dimension="platform")[:1] + repo.list_entities(dimension="power_source")[:1]
    combo = Combination(entities=entities)
    saved = repo.save_combination(combo)
    assert saved.status == "pending"

    # Mark it blocked in DB
    repo.update_combination_status(saved.id, "blocked", "test reason")

    # Re-saving should pick up the blocked status
    combo2 = Combination(entities=entities)
    reloaded = repo.save_combination(combo2)
    assert reloaded.id == saved.id
    assert reloaded.status == "blocked"
    assert reloaded.block_reason == "test reason"